Smaller front wheel bicycles became popular in the late 1980s with the influx of women into triathlons. There were literally dozens of models, so they're not as rare as you think. There is a thread on the forum dedicated to this bicycle style. I know Bianchi produced the Sport SX in this style, but this appears to be nicer. Those look like 600 Ultegra components. The decal style indicates circa 1988/1989.